Sheet-metal-seaming tool



Dec. 15 4 H. ROSENBERG SHEET METAL SEAMING TOOL Filed Aug. 23, 1923 2 Sheets-Sheet l Jwpvntox fiymaw ias'enlmy 1,566,125 H. ROSENBERG SHEET METAL SEAMING TOOL Filed Aug. 23. 1923 2 Sheets-Sheet 2 2 m l i g a n! 1. a 8 h 9 8 %0 fieyman 10S Qwerty Patented Dec. 15, 1925.

HEYMAN ROSENBERG, OF NEW YORK, N. Y.

SHEET-METAL-SEAMING TOOL.

Application filed August 23, 1923.

To all 107mm it may concern:

Be it known that I, HEYMAN ROSENBERG, a citizen of theUnited States, residing at New York, in the county of New Yorkand State of New York, have invented certain new and useful Improvements in Sheet- Metal-Seaming Tools, and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in tools for working sheet metal, and more particularly to such as are adapted for manual double seaming or riveting, and other sheet bending operations.

The object in view is the simplification of such devices for enabling a single instrument to do the work of a large variety of such tools as now commonly in use.

With this and various other detail objects in View, the invention comprises certain novel constructions, combinations and an rangments of parts as subsequently specified and claimed. y

In the accompanying drawings,

Figure 1 is a top plan view of a tool or instrument embodying the features of the present invention.

Figure 2 is a side view thereof, the location of the work bench being indicated in dotted lines.

Figure 3 is a view similar to Figure 1, a fragment of the holder being broken away and the mandrel being shown in one of its angular positions. I

Figure 4 is a transverse section taken on the plane indicated by line 4-4 of Figure 2 and looking toward the anchoring bolt, parts being broken away.

Figure 5 is a fragmentary, horizontal section taken on the plane indicated by line 55 of Figure 2, thebolt and nut being seen in elevation.

Figure 6 is a view similar to Figure 1 of a slightly modified embodiment, parts of the holder being broken away and the parts being shown on an enlarged scale.

Figure 7 is a sectional elevation of the side of the parts seen in Figure 6, the section being taken on a plane extending through the axis of the anchoring shank, the said shank and its set screw being shown in elevation. 4

/ Figure 8 is a fragmentary, horizontal sec- Serial No. 658,932.

tion taken on the plane indicated by line 88 of Figurei', and looking downward.

Figure 9 is a fragmentary, vertical section taken on the plane indicated by line 99 ofFigure 8.

Referring to the drawings by numerals, 1 indicates the holder, which is preferably formed with a curved, upper surface, and a fiat, under surface, as best seen in Figure l, and provided with a longitudinal, undercut groove 2 extending from its inner end to a point near its outer end. he groove 2- is adapted to be engaged by the head 3 of a clamping bolt 4, which is adjustable along the holder 1, or the holder 1 is adjustable across the head 3, when the bolt 4: is anchored in a wm'k-bench. A clamping bolt (3 is threaded on to the lower portion of bolt 4, and provided with an operating handle 7 for facilitating the drawing down of the bolt for clamping the holder 1 tightly against the bench 5 at any point desired. @utward of the outer terminus of the groove the body of the holder 1 is flattened and. formed with an upstanding shoulder 8, preferably slightly inclined as best seen in Figure 2. The portion of the body of holder 1 outward from the shoulder 8 has its upper surface preferably perfectly flat and its outer extremity rounded and beveled, as seen at 9. The said flat portion is also formed with a vertical aperture 10.

A mandrel 11 ismounted to rest on the fiat surface of that portion of holder 1 outward of the shoulder 8, and the mandrel is preferably also formed fiat at its under and upper faces and provided with a depending shank or pin 12, preferably formed integral with, or appropriately fixed to, the mandrel 11, and projecting into the aperture 10. The mandrel 11 has preferably all of its edges beveled as seen at 13, for enabling the mandrel to fit up close against the work when double seaming is being done, and the said edges are of various shapes at various places about the mandrel, two of the sides being straight and meeting a transversely straight side to produce angles or corners 14, 14, so that the mandrel may be said to be squared at these portions, while the straight sides terminate in' a rounded portion 15, these various shapes being pro vided in order to enable the finishing of work on square elbows and curved parts of all kinds and shapes.

The mandrel 11 is designed to be shifted angularly on its shank 12 to any of numerous di ereat positions, such as are required for the various kinds of work to be done.

One of such positions is indicated in Figure 1 and another in Figure 3, the latter showing clearly that the distance from the axis of rotation of the mandrel in its various adjustments incident to angular movement of its shanl: to the shoulder S greater than the longest straight line which can be drawn from such axis horizontally to any point or extremity of the mandrel 11. The mandrel 11 thus is free for complete revolution or any angular adjustment without liability of contact with or interference from the shoulder 8.

To lock th. andrel 11 at any given adjusted position, a bolt 16 is let into the body of the holder 1 transversely of the shank 12, and in position to intersect a portion of the p iphery of said shank. The bolt 16. however. formed with an arcuate notch 17 corresponding to the curve of the shank 12, so to sccommodate the shank 12 for in sertion and removal thereof into and out of the aperture 10 when the bolt 16 is located with the notch 17 exactly flush with the walls of the aperture 10. The outer end portion of the bolt 16 is threaded and carries a nut 18, which rests against the side of the holder 1. and manipulation of the nut 18 n a direction for threading the same inward. along the bolt 16 will effect a converse outward longitudinal travel of said bolt. Thus. when the parts are in the position seen in Figure 5, when the nut 18 is manipulated as stated, the inclined wall of the notch 17 acting on the inclined wall of the shank 12 will function as a wedge, growing tighter and tighter as the bolt 16 drawn outward through the operation of nut- 18. This continues until the shank 12 is effectively locked againstany movement, and the mandrel 11 will be correspondingly locked. The actual amount of movement of the bolt 16 is very slight. and it functions uuickly and effectively to lock and to release the shank 12 when required.

In operation. the mandrel 11 is set at any of its adjusted positions required and locked by the manipulation of the nut 18. The sheet metal is then placed in engagementwith the mandrel 11 and the seaming work carried on in the usual manner, such, for example. as bending the sheet across the angle of the mandrel as by the aid of a mallet or like tool. Interlocking seams are thus produced, and may then. be fiattened down by blows of the mallet upon the seam being formed with the seam resting on the exposed, flat face of the mandrel. Of course, the holder 1 is adjusted relative to the bench 5, as required, before the work is begun, and the adjustments of the mandrel 11 may be made to any extent and at any time needed for providing in effect a tool which affords a flat mandrel for flatwork. a square mandrel for square work, a circular mandrel. for round work, and so on conforming to the shape of any kind of work desired to be done.

In Figures 6 to 9, I have illustrated a. slight modification of the structure above described, the parts being identical with the exception of the pivot shank and lockbolt. and the corresponding accommorecesses in the holder; and all other parts therefor have applied the reference numerals above employed and the same description will apply. in this embodiment, the apertures 10 are provided with tapered ribs or tinting 10", the taper thereof being clearly indicated in Figure 9. The shank 12 forming the anchoring support for the mandrel is formed with oppositely-taper ing, corresponding ribs or tluting 12 adapted to inter-mesh with the ribs or luting 10 as clearly seen in Figure 8. The shank 10 is formed intermediate its ends with an annular groove 19, which is engaged by the inner end of a bolt or set screw 20 threaded through a portion of the body of the holder. so to effectively lock the shank and mandrcl against vertical movement.

The structure shown in Figures 6 to 9 inclusive functions exactly as described with respect to the structure seen in Figure 1. except that when the mandrel is to be adjusted, it is not released and left free to revolve on its shank, but instead the s t screw 20 is backed off and the mandrel is lifted sufficiently high to cause the ribs 12 to clear themselves from the ribs 10. the mandrel is adjusted angularly, as required. and then lowered for re-engagement of the ribs and the set screw 20 re-set to engasc the groove 19. In view of the interineshing of the ribs 10 and 12* av clamping action of the set screw 20 is not required. but the said set screw may. if desired. be threaded in far enough to grip the base of the groove 19 and assist in retaining the mandrel rigidly in place. In this construction. the number of positions of which the mandrel is capable is limited to the number of flutings. while the number of positions shown in Figure 1 is limitless, but the possible adjustments of the structure seen in Figure 6 are sufficient for all practical purposes. and the anchorage is very effective. assuring against any possible slipping or loosening of the parts during operation.

What is claimed is:

1. A sheet metal seaming tool comprising a mandrel having a fiat working surface and beveled edges bounding the working surface, the beveled edges being rounded at one place and squared at another. a holder for the mandrel, and means of adjustable engagement between the mandrel and holder.

2. A sheet metal seaming tool comprising a holder adapted to be anchored to a support and having a flat face terminating in an offset shoulder, a mandrel having two flat faces, one adapted to engage the fiat face of the holder and the other exposed away from the holder, the edge of the mandrel between said flat faces being of different shapes at different places, and means of adjustable engagement between the mandrel and holder.

3. A sheet metal seaming tool comprising a holder having an offset shoulder, a mandrel having a roundedportion and a squared portion, an adjustable connection between the mandrel and holder spaced from the holder sufficiently for permitting free pivotal movement of the mandrel, and means for locking the mandrel against such movement.

4. In sheet metal seaming tools, the combination, with an anchoring bolt having a head, of a holder having an undercut groove receiving the head of the bolt for enabling the bolt to clamp the holder to a support for permitting adjustment of the holder in the direction of the length of the groove, and a mandrel carried by said holder.

5. A sheet metal seaming tool comprising a holder having a ribbed aperture, and a mandrel carried by the holder and having a ribbed projection extending into the aperture with the ribs of the holder and mandrel engaging to prevent angular adjustment of the mandrel relative to the holder.

6. A sheet metal seaming tool comprising a holder having a ribbed aperture, a mandrel carried by the holder and having a ribbed projection extending into the aperture with the ribs of the holder and mandrel engaging to prevent angular adjustment of the mandrel relative to the holder, and a bolt engaging the parts for locking them against separation.

7. A sheet metal seaming tool comprising a holder having an aperture formed with a tapering bead, and a mandrel carried by said holder and having a projection extending into said aperture and formed with a correspondingly-oppositely tapered bead adapted to engage the bead of the holder for preventing relative angular adjustment of the parts with respect to each other, and means for locking the mandrel against separation from the holder.

8. A sheet metal seaming tool comprising a holder having an aperture formed with fluting, a mandrel carried by the holder and having a projection extending into said aperture and formed with fluting intermeshing with the fluting of the holder.

9. In sheet metal seaming tools comprising a holder having an aperture formed with fluting, a mandrel carried by the holder and having a projection extending into said aperture and formed with fluting intermeshing with the fiuting of the holder, the fluting of the holder tapering in one direction and the fiuting of the projection of the mandrel oppositely and correspondingly tapering.

10. A sheet metal seaming tool comprising a holder having an aperture formed with fiuting, a mandrel carried by the holder and having a projection extending into said aperture and formed with fluting intermeshing with the fluting of the holder, the projection being formed with an annular groove, and a bolt engaging the holder and extending into said groove.

In testimony whereof I aifix my signature.

HEYMAN ROSENBERG. 

